As someone who does this for a living, I would offer the following advice:
Keep it simple! Who you are, what you do, and how they get a hold of you.
If they can`t read it, you are wasting your money.
I can`t tell you how many vehicles I see with splashy, overly colorful graphics that drown out the company name and other information.
There is a candy company near me that has a car with all these chocolate candy images on it and I could never read the company name until one day it happened to pull up next to me at a stop light.
Just because you can wrap a whole vehicle doesn`t mean you should.
The whole issue boils down to whether I want to put time and training into a person who may be gone in 3 months - and then I have to start over.
I cannot quantify hiring her for any other reason than a gut instinct. If I am wrong it causes a big problem for me and my company. It has already caused a big rift between my partner and I.